Can you think of any three-dimensional shape that comprises of exactly two surfaces?

In one of the popular batman series movie "Batman Forever", there was a riddle that goes like "Tear me off and then scratch my head and I was red then and now I am back. Who am I?

What is black when you buy it, red when you use it, and gray when you throw it away?

Find the combined weight of the Cat, Dog and Rabbit in the given picture.

What is full of holes but still holds water?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

Christina, Allison and Lena are 3 daughters of John a well-known Mathematician, When I asked John the age of their daughters. He replied "The current age of her daughters is prime. Also, the difference between their ages is also prime."

How old are the daughters?

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?

In the Thar desert, 3 men found a big 24L Jar is full of water. Since there is a shortage of water so they decided to distribute the water among themselves such that they all have equal amounts of it. But they only have a 13L, a 5L and an 11-litre Jar.

How do they do it?

Which is the smallest number that you can write using all the vowels exactly once?